X-Men #37 – VF- (1st series) – 1st Appearance Mutant Master!
First appearance of the Mutant-Master.
Cover pencils by Don Heck, John Verpoorten, and John Romita (alterations), inks by John Verpoorten and John Romita (alterations). We, the Jury…, script by Roy Thomas, pencils by Ross Andru, inks by Don Heck; the X-Men battle the Factor Three in Europe; the Mutant-Master holds Professor X and Banshee captive; Juggernaut cameo. Letter to the editor from writer Peter Sanderson. 36 pgs. $0.12. Cover price $0.12.